Torque converter with improved torque converter clutch performance

ABSTRACT

A torque converter, including: a cover; a first through bore for receiving a transmission input shaft; a clutch including a piston plate; a plurality of fasteners connected to the cover; and a plate connected to the cover. The plate includes a radially aligned wall including a plurality of openings in which the plurality of fasteners is disposed; a second through bore at least partially aligned, in an axial direction, with the first through bore; and a plurality fins extending from the radially aligned wall in the axial direction. Each fin includes a first end aligned with the first and second through bores in the axial direction. Each fin includes a second end disposed radially within the plurality of openings. A space, aligned with an axis of rotation for the torque converter and the second through bore, is formed between the respective first ends.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 U.S.C. §119(e) of U.S.Provisional Patent Application No. 61/358,527 filed on Jun. 25, 2010which application is incorporated herein by reference.

FIELD OF THE INVENTION

The invention broadly relates to wet clutches, more specifically to aplate or flow modification element for improving fluid flow fromchambers for the wet clutch.

BACKGROUND OF THE INVENTION

Wet clutches are used to provide a mechanical by-pass for hydrodynamiccoupling in torque converters in order to improve fuel economy forvehicles including the torque converters. Wet clutches also can be usedwithout a torque converter in other coupling applications. The clutch isengaged and stays locked as soon as the vehicle is launched and stayslocked in all kind of driving condition. A hydrodynamic force appliesforce to a piston plate for the clutch in order to engage and keep theclutch locked. This hydrodynamic force results from the differentialpressure between apply and release pressures on either side of thepiston plate. High engine speed creates high rotational velocity at thecenter of the torque converter which creates a Coriolis Effect. TheCoriolis Effect on the disengagement side of the piston plate causes aresistance to oil flow out of the disengagement chamber for the clutch,which increases the piston plate back pressure, that is, pressure in thedisengagement chamber. The increase in the piston plate back pressurecauses a decrease in the differential pressure drop and subsequent dropin clutch torque capacity. Coriolis force increases with engine speedand has a significant effect in higher engine speeds. In other words wetclutches lose torque capacity at higher engine speed because of theCoriolis Effect.

FIG. 1 is a perspective view of a prior art drive plate 1 for a torqueconverter including radially aligned wall 2 and through bore 9. Plate 1can be connected to a piston plate for a torque converter clutch in thetorque converter via openings 7 and can be connected to a cover for thetorque converter via openings 3. Bore 9 is circular.

U.S. Pat. No. 4,951,467 teaches grooves or protrusions on a cover for atorque converter with a torque converter clutch.

BRIEF SUMMARY OF THE INVENTION

According to aspects illustrated herein, there is provided a torqueconverter, including: a cover; a first through bore for receiving atransmission input shaft; a clutch including a piston plate; and a plateconnected to the cover and including a radially aligned wall. The plateincludes one of a second through bore in the radially aligned wall, thesecond through bore at least partially aligned, in an axial direction,with the first through bore; a plurality of third through bores in theradially aligned wall; or a fourth through bore in the radially alignedwall at least partially aligned with the first through bore. The secondbore includes at least two slots, the slots being symmetrically spacedin a circumferential direction and being aligned with respect radii froman axis of rotation for the torque converter; or a protrusion from theradial wall forming a portion of a circumference of the second throughbore. Each third through bore is at least partially aligned, in theaxial direction, with the first through bore. For the fourth bore, theplate includes a plurality fins extending from the radially aligned wallin the axial direction and at least partially aligned with the turbinehub in the axial direction.

According to aspects illustrated herein, there is provided a torqueconverter, including: a cover including a recess aligned, in an axialdirection, with an axis of rotation for the torque converter; a firstthrough bore for receiving a transmission input shaft; a clutchincluding a piston plate; and a flow modification element. The flowmodification element includes a first portion disposed in the recess forthe cover and a plurality of flow bars extending, away from the firstportion in the axial direction and radially outward from the firstportion, into a space between the cover and the piston plate.

According to aspects illustrated herein, there is provided a torqueconverter, including: a cover; a first through bore for receiving atransmission input shaft; a clutch including a piston plate; a pluralityof fasteners connected to the cover; and plate connected to the cover.The plate includes a radially aligned wall including a plurality ofopenings in which the plurality of fasteners is disposed; a secondthrough bore, the second through bore at least partially aligned, in anaxial direction, with the first through bore; and a plurality finsextending from the radially aligned wall in the axial direction. Eachfin includes a first end aligned with the first and second through boresin the axial direction. Each fin includes a second end disposed radiallywithin the plurality of openings. A space, aligned with an axis ofrotation for the torque converter and the second through bore, is formedbetween the respective first ends.

BRIEF DESCRIPTION OF THE DRAWINGS

The nature and mode of operation of the present invention will now bemore fully described in the following detailed description of theinvention taken with the accompanying drawing figures, in which:

FIG. 1 is a perspective view of a prior art plate;

FIG. 2A is a perspective view of a cylindrical coordinate systemdemonstrating spatial terminology used in the present application;

FIG. 2B is a perspective view of an object in the cylindrical coordinatesystem of FIG. 1A demonstrating spatial terminology used in the presentapplication;

FIG. 3 is a partial cross-sectional view of a torque converter with aplate;

FIG. 4 is an exploded view of a portion of the torque converter shown inFIG. 3;

FIG. 5 is a front view of a the plate shown in FIG. 3;

FIG. 6 is a front view of an example embodiment for the plate shown inFIG. 3;

FIG. 7 is a cross-sectional view of the plate shown in FIG. 6, generallyalong line 7-7 in FIG. 6;

FIG. 8 is a partial cross-sectional view of the plate shown in FIG. 6installed in the torque converter shown in FIG. 3;

FIG. 9 is an example embodiment of a plate for the torque convertershown in FIG. 3;

FIG. 10 is a front view of an example embodiment for the plate shown inFIG. 9;

FIG. 11 is a cross-sectional view of the plate shown in FIG. 10,generally along line 11-11 in FIG. 10;

FIG. 12 is a front view of an example embodiment for the plate shown inFIG. 9;

FIG. 13 is a detail of the plate shown in FIG. 12;

FIG. 14 is an example embodiment of the plate for torque converter 10shown in FIG. 3;

FIG. 15 is an example embodiment of the plate for torque converter 10shown in FIG. 3;

FIG. 16 is an example embodiment of the plate for torque converter 10shown in FIG. 3;

FIG. 17 is a partial cross-sectional view of a torque converter with aflow modifying element;

FIGS. 18 through 20 are example embodiments of the flow modifyingelement shown in FIG. 17;

FIG. 21 is a partial cross-sectional view of a torque converter with aflow modifying element with a single segment and a projection weld; and,

FIG. 22 is a back view of a portion of a cover with flow a modifyingelement positioned in slots in the recess.

DETAILED DESCRIPTION OF THE INVENTION

At the outset, it should be appreciated that like drawing numbers ondifferent drawing views identify identical, or functionally similar,structural elements of the invention. While the present invention isdescribed with respect to what is presently considered to be thepreferred aspects, it is to be understood that the invention as claimedis not limited to the disclosed aspects.

Furthermore, it is understood that this invention is not limited to theparticular methodology, materials and modifications described and assuch may, of course, vary. It is also understood that the terminologyused herein is for the purpose of describing particular aspects only,and is not intended to limit the scope of the present invention, whichis limited only by the appended claims.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood to one of ordinary skill inthe art to which this invention belongs. Although any methods, devicesor materials similar or equivalent to those described herein can be usedin the practice or testing of the invention, the preferred methods,devices, and materials are now described.

FIG. 2A is a perspective view of cylindrical coordinate system 80demonstrating spatial terminology used in the present application. Thepresent invention is at least partially described within the context ofa cylindrical coordinate system. System 80 has a longitudinal axis 81,used as the reference for the directional and spatial terms that follow.The adjectives “axial,” “radial,” and “circumferential” are with respectto an orientation parallel to axis 81, radius 82 (which is orthogonal toaxis 81), and circumference 83, respectively. The adjectives “axial,”“radial” and “circumferential” also are regarding orientation parallelto respective planes. To clarify the disposition of the various planes,objects 84, 85, and 86 are used. Surface 87 of object 84 forms an axialplane. That is, axis 81 forms a line along the surface. Surface 88 ofobject 85 forms a radial plane. That is, radius 82 forms a line alongthe surface. Surface 89 of object 86 forms a circumferential plane. Thatis, circumference 83 forms a line along the surface. As a furtherexample, axial movement or disposition is parallel to axis 81, radialmovement or disposition is parallel to radius 82, and circumferentialmovement or disposition is parallel to circumference 83. Rotation iswith respect to axis 81.

The adverbs “axially,” “radially,” and “circumferentially” are withrespect to an orientation parallel to axis 81, radius 82, orcircumference 83, respectively. The adverbs “axially,” “radially,” and“circumferentially” also are regarding orientation parallel torespective planes.

FIG. 2B is a perspective view of object 90 in cylindrical coordinatesystem 80 of FIG. 1A demonstrating spatial terminology used in thepresent application. Cylindrical object 90 is representative of acylindrical object in a cylindrical coordinate system and is notintended to limit the present invention in any manner. Object 90includes axial surface 91, radial surface 92, and circumferentialsurface 93. Surface 91 is part of an axial plane, surface 92 is part ofa radial plane, and surface 93 is a circumferential surface.

FIG. 3 is a partial cross-sectional view of torque converter 10 withplate 18.

FIG. 4 is an exploded view of a portion of torque converter 10 shown inFIG. 3.

FIG. 5 is a front view of plate 18 shown in FIG. 3. The following shouldbe viewed in light of FIGS. 3 through 5. Torque converter 10 includescover 12; and through bore 15 for receiving a transmission input shaft(not shown). In one embodiment, through bore 15 is at least partiallyformed by turbine hub 13. The torque converter also includes clutch 17including piston plate 20. In one embodiment, the torque converterincludes plate 18 connected to the cover and including radially alignedwall 19. In one embodiment, the plate includes through bore 34 in theradially aligned wall. Through bore 34 is at least partially aligned, inaxial direction 21, parallel to axis of rotation 23 for the torqueconverter, with through bore 15. In one embodiment, the torque converteralso includes impeller 14, turbine 16, plate 22, and leaf springs 30.

In one embodiment, through bore 34 includes at least two slots 31symmetrically spaced in circumferential direction 33. In one embodiment,the slots are aligned with respect to respective radii 35 from axis ofrotation 23. In one embodiment, space 37 forming a portion of throughbore 34 is aligned with the axis of rotation. It should be understoodthat plate 18 can be formed of any material known in the art, using anyfabricating process known in the art. In one embodiment, plate 18 is adrive plate and is fastened to the piston plate by any means known inthe art, for example, leaf springs 30 connected to the plate viafasteners in openings 28. In one embodiment, plate 18 is fastened to thecover by any means known in the art, for example, extruded rivetsdisposed in openings 24.

FIG. 6 is a front view of an example embodiment for plate 18 shown inFIG. 3.

FIG. 7 is a cross-sectional view of plate 18 shown in FIG. 6, generallyalong line 6-6 in FIG. 7.

FIG. 8 is a partial cross-sectional view of plate 18 shown in FIG. 6installed in torque converter 10 shown in FIG. 3. The following shouldbe viewed in light of FIG. 3-8. FIGS. 6 and 7 show a sequence of formingbore 34 and protrusion 38. In one embodiment, through bore 34 includescircumference 39 and the radial wall includes protrusion 38 formed froma same piece of material as the radial wall. Protrusion 38 is alignedwith through bore 15 in the axial direction and forms portion 41 of thecircumference of through bore 34. In one embodiment, slit 43 is punchedin plate 18 as shown in FIG. 6 and segment 44 is bent to form theprotrusion shown in FIG. 7. Transmission input shaft 46 is disposed inthrough bore 15 in FIG. 8.

As noted supra, high engine speed, and subsequent high rotation speedfor a torque converter, such as torque converter 10, creates highrotational velocity at the center of the torque converter, for example,in and around through bore 15 and space 47 between a plate and theturbine hub. This velocity creates a Coriolis Effect on fluid, such asoil, in the torque converter. The Coriolis Effect in back of the pistonplate, for example, in release chamber 25, causes a resistance to oiloutput flow from chamber 25 through a transmission shaft in through bore15, which increases the piston plate back pressure, that is, thepressure in chamber 25. The back pressure increase in turn causes thedifferential pressure between chamber 25 and engage chamber 27 to drop,which in turn causes a drop in clutch torque capacity. Slots 31 andprotrusion 38 work to disrupt the Coriolis effect noted above, whichenables greater output flow from chamber 25, an increase in thedifferential pressure between chamber 25 and 27, and an increase incapacity for clutch 17. That is, the slots and the protrusion act todecrease oil flow speed proximate bore 15, which facilitates desired oilflow out of chamber 25.

FIG. 9 is an example embodiment of plate 50 for torque converter 10shown in FIG. 3. The following should be viewed in light of FIGS. 3, 4,and 9. In one embodiment, the torque converter includes plate 50connected to the cover and including radially aligned wall 51. Plate 50includes a plurality of through bores 58 in radially aligned wall 51.Each through bore 58 is at least partially aligned, in the axialdirection, with through bore 15. In one embodiment, the plurality ofbores 58 consists of three bores, each through bore 58 has a same shapein a radial plane, and said through bore 58 has a same area in theradial plane. In one embodiment, circumferentially adjacent bores 58 areseparated by respective divider portions 57 connected to the radial walland radially aligned with the radial wall. Advantageously, in theembodiment of FIG. 9, there are no protrusions extending axially fromplate 50, in particular, wall 51. Therefore, the embodiment of FIG. 9takes up less axial space, which may advantageously reduce the axialspace requirement for a torque converter using plate 50. In oneembodiment, plate 50 is a drive plate fastened to the piston plate byany means known in the art, for example, leaf springs 30 connected tothe plate via fasteners in openings 28. In one embodiment, plate 50 isfastened to the cover by any means known in the art, for example,extruded rivets disposed in openings 24.

FIG. 10 is a front view of an example embodiment for plate 50 shown inFIG. 9.

FIG. 11 is a cross-sectional view of plate 50 shown in FIG. 10,generally along line 11-11 in FIG. 10. The following should be viewed inlight of FIGS. 3, 5, and 9-11. FIGS. 10 and 11 show a sequence offorming bores 58 and protrusions 53. In one embodiment, the plurality ofthrough bores 58 includes two through bores with respectivecircumferences 52 and the radial wall includes protrusions 53 formedfrom a same piece of material as the radial wall. Protrusions 53 arealigned with through bore 15 in the axial direction and form respectiveportions 54 of the circumference of through bores 58. In one embodiment,slits 55 are punched in plate 50 as shown in FIG. 10 and segments 58 arebent to form the protrusions as shown in FIG. 11. Through bores 58 andprotrusions 53 work to disrupt the Coriolis effect noted above, whichenables greater output flow from chamber 25, an increase in thedifferential pressure between chamber 25 and 27, and an increase incapacity for clutch 17.

FIG. 12 is a front view of an example embodiment for plate 50 shown inFIG. 9.

FIG. 13 is a detail of plate 50 shown in FIG. 12. The following shouldbe viewed in light of FIGS. 3, 5, 9, 12, and 13. FIGS. 12 and 13 show asequence of forming bores 58 and protrusions 59. In one embodiment, theplurality of through bores 58 includes three through bores 58 and theradial wall includes protrusions 59 formed from a same piece of materialas the radial wall. Protrusions 139 are aligned with through bore 15 inthe axial direction. In one embodiment, segments 56 are punched from theradial wall, as shown in FIG. 12 and are bent to form protrusions 59 asshown in FIG. 13.

Through bores 58 and protrusions 59 work to disrupt the Coriolis effectnoted above, which enables greater output flow from chamber 25, anincrease in the differential pressure between chamber 25 and 27, and anincrease in capacity for clutch 17.

FIG. 14 is an example embodiment of plate 60 for torque converter 10shown in FIG. 3.

FIG. 15 is an example embodiment of plate 60 for torque converter 10shown in FIG. 3. The following should be viewed in light of FIGS. 3, 4,14, and 15. In one embodiment, the torque converter includes plate 60connected to the cover and including radially aligned wall 61. Plate 60includes through bore 67 in the radially aligned wall. Bore 67 is atleast partially aligned with through bore 15. Plate 60 also includes aplurality fins 69 extending from the radially aligned wall in the axialdirection and at least partially aligned with the turbine hub in theaxial direction. In one embodiment, plate 60 includes two fins 69, asshown in FIG. 14. In one embodiment, plate 60 includes six fins 69, asshown in FIG. 15. In one embodiment, plate 60 is a drive plate fastenedto the piston plate by any means known in the art, for example, leafsprings 30 connected to the plate via fasteners in openings 28. In oneembodiment, plate 60 is fastened to the cover by any means known in theart, for example, extruded rivets disposed in openings 24.

In one embodiment, fins 69 are symmetrically disposed in circumferentialdirection 33. In one embodiment, portions 63 of the fins are not alignedwith through bore 67. In one embodiment, portions 65 of the fins arealigned with through bore 67. In one embodiment, each fin 69 includes arespective distal end 66 axially aligned with through bore 67 andthrough bore 67 includes space 64, aligned with through bore 67 in theaxial direction and formed between the respective distal ends. In oneembodiment (not shown), ends 62 of the fins do not extend radiallybeyond openings 24.

FIG. 16 is an example embodiment of plate 60 for torque converter 10shown in FIG. 3. The following should be viewed in light of FIGS. 3, 4,and 14-16. In one embodiment, plate 60 includes through bore 67 in theradially aligned wall and single fin 69 extending from the radiallyaligned wall in the axial direction and at least partially aligned withthe turbine hub in the axial direction. In one embodiment, portions 71of the fin are axially aligned with the radial wall and portion 73 ofthe fin is axially aligned with bore 67.

Through bore 67 and fins 69 work to disrupt the Coriolis effect notedabove, which enables greater output flow from chamber 25, an increase inthe differential pressure between chamber 25 and 27, and an increase incapacity for clutch 17.

FIG. 17 is a partial cross-sectional view of torque converter 140 withflow modifying element 150.

FIGS. 18 through 20 are example embodiments of flow modifying element150 shown in FIG. 17. The following should be viewed in light of FIGS.17 through 20. Torque converter 140 includes cover 141 with recess 142,aligned with axis of rotation 143 for the torque converter, and throughbore 146. In one embodiment, the through bore is at least partiallyformed by damper hub 145. In FIG. 17, transmission input shaft 148 isdisposed in the through bore. The torque converter also includes clutch147 including piston plate 144. The torque converter includes flowmodifying element 150 including portion 151 disposed in recess 142 andplurality of flow bars 152 extending away from the portion 142 in axialdirection 21 and radially outward from portion 151 into space 153between the cover and the piston plate. In one embodiment, element 150is press-fit into cover 147.

In one embodiment, portion 151 is in a ring shape with through bore 154at least partially aligned with bore 146 in axial direction 21, as shownin FIG. 18. In one embodiment, portion 151 is solid disc at leastpartially aligned with bore 146 in axial direction 21, as shown in FIG.19. Although bars 152 are shown with a particular size andconfiguration, it should be understood that bars 152 are not limited tothe size and configuration shown. Although element 150 is shown withfour flow bars in FIGS. 18 and 19, it should be understood that element150 is not limited to a particular number of flow bars.

In one embodiment, element 150 includes segments 150A and 150B as shownin FIG. 20. In one embodiment, segments 150A and 150B are each planarand are connected one to the other at central locations 155A and 155B,respectively. In one embodiment, segments 150A and 150B are notched atcentral locations 155A and 155B such that the segments are interlocked.In one embodiment, segments 150A and 150B are aligned with axis ofrotation 151 such that segments 150A and 150B are orthogonal to eachother with respect to the axis of rotation.

Through 151 and flow bars 152 work to disrupt the Coriolis effect notedabove, which enables greater output flow from disengagement chamber 160,an increase in the differential pressure between chamber 25 andengagement chamber 161, and an increase in capacity for clutch 143.

FIG. 21 is a partial cross-sectional view of torque converter 140 withflow modifying element 150 with a single segment 150C and a projectionweld. In one embodiment, element 150 includes a single segment 150C.Segment 150C is shaped like segment 150A or 150B. In one embodiment,segment 150C does not include the interlocking feature of segments150A/B. Cover 147 is formed with dimple 170, facing through bore 146,and segment 150C is placed in recess 142 without a press fit. Projectionwelding is used to connect segment 150C to cover 142 at dimple 170. Inone embodiment, segment 150C is placed in recess 142 such that the onlycontact with the cover is at the dimple, in order to obtain a propercurrent path for the projection welding.

FIG. 22 is a back view of a portion of cover 147 with flow modifyingelement 150 positioned in slots in the recess. In one embodiment, insidesurface 172 of the recess is formed with slots 174. In one embodiment,slots 174 are formed and segment 150C is placed in the slots such thatthe segment does not contact the cover at the slots. Projection weldingis used to connect segment 150C to cover 142 at dimple 170.

In one embodiment, slots 174 are formed and segment 150C is placed inthe slots such that the segment contacts the cover at the slots. In oneembodiment, cover 147 does not include a dimple, such as dimple 170, andthe segment does not contact front portion 176 of the cover. Projectionwelding is used to connect segment 150C to cover 142 at the slots. Thatis, the current path for the projection welding is through the contactof the segment with the cover at the slots, rather than through a dimplein portion 176.

Thus, it is seen that the objects of the present invention areefficiently obtained, although modifications and changes to theinvention should be readily apparent to those having ordinary skill inthe art, which modifications are intended to be within the spirit andscope of the invention as claimed. It also is understood that theforegoing description is illustrative of the present invention andshould not be considered as limiting. Therefore, other embodiments ofthe present invention are possible without departing from the spirit andscope of the present invention.

1. A torque converter, comprising: a cover; a first through bore forreceiving a transmission input shaft; a clutch including a piston plate;and, a plate connected to the cover and including a radially alignedwall and one of: a second through bore in the radially aligned wall, thesecond through bore at least partially aligned, in an axial direction,with the first through bore and including: at least two slots, the slotsbeing symmetrically spaced in a circumferential direction and beingaligned with respect radii from an axis of rotation for the torqueconverter; or, a protrusion from the radial wall forming a portion of acircumference of the second through bore; a plurality of third throughbores in the radially aligned wall, wherein each third through bore isat least partially aligned, in the axial direction, with the firstthrough bore; or, a fourth through bore in the radially aligned wall atleast partially aligned with the first through bore, wherein the plateincludes a plurality fins extending from the radially aligned wall inthe axial direction and at least partially aligned with the turbine hubin the axial direction.
 2. The torque converter of claim 1 wherein thesecond through bore includes a space aligned with an axis of rotationfor the torque converter.
 3. The torque converter of claim 1 wherein:the circumference for the second through bore is semi-circular in shape;and, the protrusion from the radial wall is formed from a same piece ofmaterial as the radial wall and is aligned with the first through borein the axial direction.
 4. The torque converter of claim 1 wherein: theplurality of third through bores includes a pair of third through bores;the pair of third through bores includes respective circumferences; theradial wall includes first and second protrusions, formed from a samepiece of material as the radial wall, aligned with the first throughbore in the axial direction; and, the first and second protrusions formrespective portions of the respective circumferences.
 5. The torqueconverter of claim 1 wherein: the plurality of third through boresconsists of three third through bores; each third through bore has asame shape in a radial plane; and, said each third through bore has asame area in the radial plane.
 6. The torque converter of claim 5wherein circumferentially adjacent third through bores are separated byrespective divider portions connected to the radial wall and radiallyaligned with the radial wall
 7. The torque converter of claim 1 whereinthe plurality of fins is not aligned with the fourth through bore in theaxial direction.
 8. The torque converter of claim 1 wherein: theplurality of fins consists of two fins; or, the plurality of finsincludes more than two fins.
 9. The torque converter of claim 1 whereinthe plurality of fins is symmetrically disposed in a circumferentialdirection.
 10. The torque converter of claim 1 wherein the plurality offins is at least partially aligned with the fourth through bore in theaxial direction.
 11. The torque converter of claim 10 wherein: each finincludes a respective distal end axially aligned with the fourth throughbore; and, a space, aligned with the fourth through bore in the axialdirection, is formed between the respective distal ends.
 12. A torqueconverter, comprising: a cover including a recess aligned, in an axialdirection, with an axis of rotation for the torque converter; a firstthrough bore for receiving a transmission input shaft; a clutchincluding a piston plate; and, a flow modification element including: afirst portion disposed in the recess for the cover; and, a plurality offlow bars extending, away from the first portion in the axial directionand radially outward from the first portion, into a space between thecover and the piston plate.
 13. The torque converter of claim 12 whereinthe first portion is in a ring shape with a second through bore at leastpartially aligned with the first through bore in the axial direction.14. The torque converter of claim 12 wherein: the flow modificationelement includes first and second segments; the first and secondsegments are planar; and, the first and second segments are connectedone to the other at respective central locations aligned with the axisof rotation such that the first and second segments are orthogonal toeach other with respect to the axis of rotations.
 15. The torqueconverter of claim 12 wherein: the flow modification element includes asingle planar segment; and, the single planar element is connected tothe cover, at the first portion, by a projection weld.
 16. The torqueconverter of claim 15 wherein: the recess is partially formed by aradial wall of the cover; the radial wall of the cover includes a dimplefacing the first through bore; and, the projection weld is at thedimple.
 17. The torque converter of claim 16 wherein: the recess ispartially formed by a radially inwardly facing surface of the cover; theradially inwardly facing surface includes two slots; and, the singleplanar element is disposed in the two slots.
 18. The torque converter ofclaim 15 wherein: the recess is partially formed by a radially inwardlyfacing surface of the cover; the radially inwardly facing surfaceincludes two slots; the single planar element is disposed in the twoslots; and, the projection weld is at the two slots.
 19. A torqueconverter, comprising: a cover; a first through bore for receiving atransmission input shaft; a clutch including a piston plate; a pluralityof fasteners connected to the cover; and, a plate connected to the coverand including: a radially aligned wall including a plurality of openingsin which the plurality of fasteners is disposed; a second through bore,the second through bore at least partially aligned, in an axialdirection, with the first through bore; and, a plurality fins extendingfrom the radially aligned wall in the axial direction, wherein: each finincludes a first end aligned with the first and second through bores inthe axial direction; said each fin includes a second end disposedradially within the plurality of openings; and, a space, aligned with anaxis of rotation for the torque converter and the second through bore,is formed between the respective first ends.